android 小知道积累II

PopupWindow (zhong pin)

import android.content.Context;
import android.graphics.Color;
import android.graphics.Typeface;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.PopupWindow;
import android.widget.TextView;
import android.widget.LinearLayout.LayoutParams;
import com.android.archermind.activity.R;
public class PopupWindowHelper {
	private Context context;
	// 当前所在Activity的布局ID
	private int layout;
	// 当前所在Activity的监听类（OnClickListener）
	private OnClickListener listener;
	private PopupWindow pw;
	// 当前所在Activity的最外层布局组件的ID
	private int view;
	// PopupWindow所在的y轴坐标
	private int y;
	// PopupWindow的整体高度
	private int height;
	// PopupWindow中的数据（绘制每一项）
	private String[][] datas;
	// PopupWindow中的分割线的数目
	private int lineCount;
	// 设置TextView的ID（可以设置初始值）
	private int id = 0;
	
	public PopupWindowHelper(Context context, int layout, OnClickListener listener, int view, int y, int height, String[][] datas, int lineCount, int id){
		this.context = context;
		this.layout = layout;
		this.listener = listener;
		this.view = view;
		this.y = y;
		this.height = height;
		this.datas = datas;
		this.lineCount = lineCount;
		this.id = id;
	}
	/**
	 * 弹出菜单窗口
	 */
	public PopupWindow createPopupWindow() {
        LinearLayout pwLayout = new LinearLayout(this.context);
        
		for(int i = 0; i < datas.length; i++) {
			String[] text = datas[i];
			
			if(i < lineCount) {
				initTextViewLayoutForPopup(text, pwLayout, true);
			} else {
				initTextViewLayoutForPopup(text, pwLayout, false);
			}
		}
		
		String inflater = Context.LAYOUT_INFLATER_SERVICE;
        LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(inflater);
        LinearLayout linearLayout = (LinearLayout) layoutInflater.inflate(this.layout, null);
		
		if(pw == null) {
		    pw = new PopupWindow(pwLayout); 
			pw.showAtLocation(linearLayout.findViewById(this.view), Gravity.CENTER,0,0);
		} else if(!pw.isShowing()) {
			pw.showAtLocation(linearLayout.findViewById(this.view), Gravity.CENTER,0,0); 
		}
	    pw.update(-101, this.y, 161, this.height); 	
	    
	    return pw;
	}	
	
	/**
	 * 动态加载PopupWindow的界面（用于MENU）
	 * @param texts
	 * @param pwLayout
	 * @param isNeedLine
	 */
	private void initTextViewLayoutForPopup(String[] texts, LinearLayout pwLayout, Boolean isNeedLine) {
		pwLayout.setOrientation(LinearLayout.VERTICAL);
		pwLayout.setBackgroundResource(R.drawable.popup_bg);		
		
		for(int i = 0; i < texts.length; i++, id++){
			TextView textView = new TextView(context);
			textView.setTextColor(Color.parseColor("#FFFFFF"));
			textView.setText(texts[i]);
			textView.setTypeface(null, Typeface.BOLD);
			textView.setPadding(10, 4, 0, 4);
			textView.setId(id);
			textView.setOnClickListener(this.listener);
			pwLayout.addView(textView, new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
		}
		
		if(isNeedLine) {
	        ImageView line = new ImageView(context);
	        line.setImageResource(R.drawable.pop_line);
	        line.setPadding(5, 5, 0, 0);
			pwLayout.addView(line, new LinearLayout.LayoutParams(135, LayoutParams.WRAP_CONTENT));
		}
	}		
}

输入监听：

EditText.addTextChangedListener(new TextWatcher() {
			public void afterTextChanged(Editable s) {
			}
			public void beforeTextChanged(CharSequence s, int start, int count,
					int after) {
			}
			public void onTextChanged(CharSequence s, int start, int before,
					int count) {
				showInstantResultList();
			}